Claes Engal is a texture artist at Starbreeze. In his past works you can find titles such as Decadence (Source Engine) and Warm Gun (Unreal Engine). Check out his award winning environments:
DM-Haze – Unreal Engine 3
DEC-Deathrow (assets) – Source Engine
DM-Worm – Unreal Engine 3
More screens can be found on his portfolio page.